pylint: fix import-outside-toplevel case

Fix the only case of C0415 import-outside-toplevel.

Part of #270

Author: DifferentialOrange

test/suites/lib/tarantool_server.py

@@ -15,6 +15,7 @@
 )
 
 from .tarantool_admin import TarantoolAdmin
+from .remote_tarantool_server import RemoteTarantoolServer
 
 def check_port(port, rais=True):
     try:
@@ -130,7 +131,6 @@ def __new__(cls,
                 create_unix_socket=False,
                 auth_type=None):
         if os.name == 'nt':
-            from .remote_tarantool_server import RemoteTarantoolServer
             return RemoteTarantoolServer()
         return super(TarantoolServer, cls).__new__(cls)